Area Forecast Discussion
Issued by NWS Aberdeen, SD
Issued by NWS Aberdeen, SD
Versions:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
191 FXUS63 KABR 050520 AAB AFDABR Area Forecast Discussion...UPDATED National Weather Service Aberdeen SD 1220 AM CDT Wed Jun 5 2024 .KEY MESSAGES... - Very light showers (15-25% chance) may develop across central South Dakota Wednesday morning. - Winds will increase out of the west-northwest during the day Wednesday and Thursday. Gusts of 40 to 50 mph are expected with the strongest winds over central SD Wednesday and northeastern SD on Thursday. && .UPDATE... Issued at 1212 AM CDT Wed Jun 5 2024 Updated for 06Z TAF discussion below. UPDATE Issued at 908 PM CDT Tue Jun 4 2024 The rain and associated cloud cover has exited the region to the east, and the remainder of the overnight hours will be dry. No changes made to winds or temperatures at this time. && .SHORT TERM /THIS EVENING THROUGH WEDNESDAY NIGHT/... Issued at 245 PM CDT Tue Jun 4 2024 Light showers continue to track east this afternoon behind the cold front. Showers will exit this evening and northwest winds will diminish. As the upper trough digs south with ample shortwave energy, it may generate some light sprinkles or showers across central SD late tonight into Wednesday morning. Models are in less agreement today about the precip potential for early Wednesday than they were during Monday`s runs. So, for now, only have 15 to 20% pops in. Given the drier air, virga is just as likely an outcome. Moderate caa sliding in with the upper trough, steep lapse rates and a strong jet aloft with 55kts as low as 700 mb will all contribute to a windy day across the region on Wednesday. Expect west to northwest winds to increase during the morning with gusts to 50 mph likely around the Missouri River. Issued a wind advisory for central SD for daytime Wednesday. While the rest of the area will be close to wind advisory criteria, will let the mid shift decide whether one is warranted. Right now, only 90th percentile solutions have eastern locales gusting to 45 mph or above, but wouldn`t be surprised if channeled higher elevations near the Coteau or Leola Hills hit criteria especially given the northwest alignment through the levels and potential for really good mixing. && .LONG TERM /THURSDAY THROUGH TUESDAY/... Issued at 245 PM CDT Tue Jun 4 2024 To start out the long term period at 00Z Thursday we`ll have the surface high over northern Manitoba/Ontario and an elongated ridge of high pressure set up from off the coast of WA/British Columbia through MT and far southwestern SD. At 500mb we have the low to our north across central Canada and a dominant ridge of high pressure set up from the 4-corners region through much the Pacific Northwest and southwestern Canada. A period of stronger winds will remain Wednesday night into Thursday, particularly with the stronger mixing during the afternoon hours. Model data indicates mixing up to 750-700mb Thursday afternoon, highest over central SD with the tighter pressure gradient between the low to our northeast and ridge to our southwest. Relative humidity values Thursday afternoon drop 20-25% west of the Missouri River, and 25-30% east. Fortunately, the recent rainfall and greenup of fuels will help limit some of the fire weather concerns Thursday afternoon given the winds gusting out of the northwest 25-35kts in the afternoon. The ridge of high pressure will slowly edge east across the forecast area Thursday night through at least Friday, keeping our dry weather conditons in place and result in diminishing winds. There is still some uncertainty with the strength and how far east the western 500mb ridge will be able to make it as the Canadian low dives into the northeastern U.S. for early next week. Still, 20-40% chances for mainly showers and limited thunderstorms looks reasonable for Monday into Tuesday of next week. && .AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/... Issued at 1212 AM CDT Wed Jun 5 2024 Terminals KABR,KATY,KPIR,KMBG VFR conditions will prevail across the area overnight and through the day Wednesday. West to northwest winds will increase into the 25 to 40 knot range around mid morning Wednesday and will continue through the early evening hours. A few light rain showers are possible during the day Wednesday as well, but due to the uncertainty of location, will not mention in the TAFs for now. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...Wind Advisory from 7 AM CDT /6 AM MDT/ this morning to 8 PM CDT /7 PM MDT/ this evening for SDZ003-004-009-015-016-033>035- 045-048. MN...None. && $$ UPDATE...KK SHORT TERM...Wise LONG TERM...MMM AVIATION...Parkin